Endoscopy is a medical procedure in which a flexible instrument that has a camera on the end called an endoscope is passed into an area of the body surpass the gastro-intestinal or GI tract . Gastroenterologists use endoscopy to view a patient`s GI tract and may employ a variety of endoscopic procedures. Depending on what is being examined several other types of endoscopic procedures can be used: esophagogastroduodenoscopy or EGD is used to examine the lining of the esophagus , stomach and duodenum. Endoscopic retrograde cholangiopancreatography or ( ERCP) is used to diagnose and treat a specific disease within a pancreatic or bile ducs . Enteroscopy is used to examine deeper into the small bowel and is useful when other imaging techniques have shown an abnormal finding that can`t be reached using EGD or colonoscopy . Endoscopic ultrasound or EUS combines endoscopy with ultrasound or echo- endoscopy to obtain detailed images of the digestive tract including the pancreas and surrounding abdominal organ.